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DVI-HDMI to LCDTV, ...no audio

Discussion in 'Technology' started by wileyC, Feb 25, 2012.

  1. Feb 25, 2012 at 1:25 PM
    #1
    wileyC

    wileyC [OP] Well-Known Member

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    ...well, i'm sure many have experience this, you pipe your video to your monitor/TV through a DVI-HDMI adapter and HDMI cable, only to find out you don't get audio on the monitor/TV speakers.. ...this depsite, also conecting your PC audio line out to the monitor/TV as well... :(

    ...doing a little web search-fu, it seems that a lot of folks w/ Nvidia-based graphics H/W (inlcuding little 'ole me :D) have problems getting the hardware to either encode the music over the DVI-HDMI or through the PC audio out (mini-stereo jack)... problem is something to do w/ the monitor/TV anticipating audio only through the HDMI cable input, so when the source is switched to this input, it ignores any audio coming over the PC audio line...

    BTW, i know my PC audio line is functioning properly, because i will get audio if i connect headphones directly to the PC audio out on the PC, ...just not on the headphone out on the monitor/TV... my old monitor/TV had a DVI recepticle so, this was never a problem, ...my new one doesn't so, i have to go through DVI (graphics card Geforce 9800GT) to HDMI (small adapter) to HDMI cable.. stupid TV thinks audio is coming over the HDMI, but it isn't...

    so, now you're sick of reading through this, but i'm almost there :D... seems there are only two ways to get this to, work:

    (1) go inside the computer, and use an SPDIF cable/connector to interface the motherboard to the graphics card (apparently this supposedly will actually encode audio on the DVI output, and over the HDMI cable to the monitor/TV (i.e. the way "HDMI" is supposed to work)..

    (2) open the registry editor and insert some new keys for forcing the computer to override the EDID data it queries from the monitor/TV at startup.. seems that on some forums, folks have been able to do this, so the computer thinks the TV is a "dumb" monitor, and doesn't know you are connecting through an HDMI input - then the monitor/TV doesn't anticipate audio over HDMI, and magically reverts to enabling it's PC audio input port for audio (effectively video on DVI-HDMI and audio over PC audio mini-stereo)..

    so, anyone been through this, just curious if it's worth the risk trying (2) - i'd really like to get use of the TV speakers.. :cool:

    PS... i always new HDMI would be a PITA, especially a few years back when the big box stores would tell ya how great digital copy protection was :confused:
     
  2. Feb 25, 2012 at 2:08 PM
    #2
    OZ-T

    OZ-T Did you get your precious photos ?

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    HDMI isn't a pain in the ass when your computer has an HDMI-out .

    Wasn't DVI abandoned ?
     
  3. Feb 25, 2012 at 2:11 PM
    #3
    tostidos

    tostidos Well-Known Member

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    DVI I believe doesnt support audio, and HDMI supports both audio and video. Unless you can change your settings on your PC to have audio go out the normal audio port and video out HDMI. But if that is not an option you will not get sound thru DVI.
     
  4. Feb 25, 2012 at 2:12 PM
    #4
    tostidos

    tostidos Well-Known Member

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    And HDMI is the simplest thing ever. Get a new PC with HDMI out. it works like a champ.
     
  5. Feb 25, 2012 at 2:15 PM
    #5
    Twistedfreedom

    Twistedfreedom welcome to the incredibuild

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    modded the F*ck out
    I'm pretty sure DVI doesn't carry an audio signal at all
     
  6. Feb 25, 2012 at 2:23 PM
    #6
    Geode

    Geode Well-Known Member

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    I picked up a new video card recently to pipe video/audio to my home theater via hdmi. Long story short, my desktop computer (Pentium4) is 8 years old and not actually compatible with my new video card (nvidia GeForce GT440). The specs say so, but I can't avoid the BSD's with the card.

    I did several clean installs of the OS trying to get it working (WinXP SP3)...No joy.

    An interesting side note is that the GT440 doesn't require messing with the S/Pdif connection, it is integrated into the video card.

    Anyone interested in my "new" GT440 video card?.....lol
     
  7. Feb 25, 2012 at 2:23 PM
    #7
    pudge151

    pudge151 Well-Known Member

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    DVi does not carry sound. you will need HDMI to HDMI connection or you need to run seperate audio cable
     
  8. Feb 25, 2012 at 2:54 PM
    #8
    branj

    branj Well-Known Member

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    On my sony tv i run the exact setup you explained... dvi to hdmi (i have a macbook). My tv has the option of selecting audio source (hdmi or aux) under sound settings. So i run a cord from my headphone jack on macbook directly into my tv's pc/aux audio input.
     
  9. Feb 25, 2012 at 3:11 PM
    #9
    khx73

    khx73 Well-Known Member

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    Wouldn't (1) be the easy choice?
    I was checking out this article:
    http://www.brighthub.com/computing/hardware/articles/27727.aspx
     
  10. Feb 25, 2012 at 5:01 PM
    #10
    wileyC

    wileyC [OP] Well-Known Member

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    that's what i was hoping would work for me too, ..but w/ this new LCDTV i don't see an equivalent "input" selection.. there is an "RGB-PC" input selection that uses VGA and mini-stereo PC audio, but the 3 HDMI input selections bear no indication of split video/audio sources...

    BTW, the LCDTV's manual (it's an LG 32LK450) gives a hint at at "HDMI-PC" input selection, ..but i dont' see it anywhere on the input selection menu...
     
  11. Feb 25, 2012 at 5:06 PM
    #11
    wileyC

    wileyC [OP] Well-Known Member

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  12. Feb 25, 2012 at 5:09 PM
    #12
    wileyC

    wileyC [OP] Well-Known Member

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    i didn't think so either, but turns out some graphics cards will do it... it seems like my graphics card (2-3 yrs old, twin DVI) might be able to but i have to connect an SDPIF cable from it to the motherboard... i think some of hte newer graphics cards have HDMI output connections on them, and have their own driver-supported audio codecs...
     
  13. Feb 25, 2012 at 5:14 PM
    #13
    tbturner47

    tbturner47 Well-Known Member

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    dvi doesn't carry audio. The spdif cable connects to your graphics card, not the dvi port.
     
  14. Feb 25, 2012 at 6:46 PM
    #14
    wileyC

    wileyC [OP] Well-Known Member

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  15. Feb 25, 2012 at 6:56 PM
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    tbturner47

    tbturner47 Well-Known Member

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    Copied from the link you posted...

    Since the DVI specification does not support audio-transport, an interoperability problem arises when an HDMI-source drives a legacy DVI-display (such as a PC monitor), or conversely, when a DVI-source drives an HDMI-display. While HDMI and DVI compliance rules ensure that a DVI video-connection can be successfully negotiated and established (via a mutually supported display mode), the audio signal must still be transported through means outside of the DVI connection. Typically, an HDMI equipped source will provide additional outputs for audio-only, such as line-level analog and SPDIF, which provide a baseline audio program (such as stereo PCM.)
     
  16. Feb 25, 2012 at 7:24 PM
    #16
    wileyC

    wileyC [OP] Well-Known Member

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    this also quote:

    Features specific to HDMI, such as remote-control and audio transport, are not available in devices that use legacy DVI-D signalling. However, many devices output HDMI over a DVI connector (e.g., ATI 3000-series and NVIDIA GTX 200-series video cards),[5] and some multimedia displays may accept HDMI (including audio) over a DVI input. In general, exact capabilities vary from product to product.

    and ..

    DVI connectors on PC video cards have also been increasingly able to take advantage of HDMI features such as audio output.
     
  17. Feb 25, 2012 at 8:50 PM
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    khx73

    khx73 Well-Known Member

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    Could it be by use of extra pins in the DVI connector, video cards are allowing the transport of audio out the DVI connector - which of course is only going to be used if the connected cable & device is aware of it. Like DVI-to-HDMI cables or adapters.
    See this thread...
    http://www.digitalhome.ca/forum/showthread.php?t=75963
    It is mentioned a few posts in.

    Of course you still have to ensure the audio is getting to the vid card to get sent out the DVI port in the first place.

    tbturner47 is correct in stating that the DVI spec does not do audio. However, that's not to say you can't get around it by the above method.
     
  18. Feb 26, 2012 at 8:14 AM
    #18
    myname150

    myname150 Well-Known Member

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    ^ That bit. Some video cards may support it, but not most. My 8800GTS has Dual DVI ports out, but they don't carry audio, just video. More recent video cards now have an actual HDMI port on the card, and when you install the drivers (like with nVidia) if you do the "Custom Installation" you'll see that an HDMI Audio Driver is installed along with the Graphics Driver.

    Like the person said above me, if you do have a card with a DVI port that can handle audio, there maybe extra pins to support the audio but then the receiving end has to be able to receive it too. If it were just straight DVI (PC) -> DVI (TV/Monitor), the TV/Monitor has to support receiving audio via the DVI port too which I doubt many do. Otherwise your video card may have come with a cable that's DVI on the PC end, and DVI/Audio on the receiving device end, like a TV/Monitor

    A cable like this may have come with your video card:
    [​IMG]
    The top plug is DVI, the bottom plug on the left, Green, is Audio.
     
  19. Feb 26, 2012 at 1:28 PM
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    wileyC

    wileyC [OP] Well-Known Member

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    yeah, it seems that my current video card (got about 2-3yrs ago) was from right around the time they were experimenting w/ this capability... in fact, then cards w/ HDMI out connections where rare, if at all present... i don't think my card is set up for the audio over DVI-HDMI... my card has dual DVI-I (which handles both digital video and analog VGA), and an S-video port...

    my feeling is that the monitor/TV is the problem though, because in the TV manual it says there is a way to hook up DVI (DVI-HDMI to the HDMI input) and use PC audio input (3.5mm mini-stereo) for sound... it also refers to this as the "HDMI-PC" input selection (which supposedly allows the video over HDMI, but sound over PC audio), but i don't see this option at all.. i have 3 "HDMI" input options, and an "RGB-PC" option, ..but don't see where this "HDMI-PC" option is on the input selection screen...
    :(

    anyone have a late-model LG LCDTV in the same situation?... seems that the info in the manual is misleading or downright incorrect... or is there a firmware update i can do for the TV?...
     
  20. Feb 26, 2012 at 1:38 PM
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    OZ-T

    OZ-T Did you get your precious photos ?

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